Trayvon Martin shooting: Screams, shots heard on 911 call

For the first time Friday, police told the Sentinel some of the details of their investigation.

Zimmerman told police he got out of his SUV to follow Trayvon on foot, and the 17-year-old came toward him. The two got into a fight, and Zimmerman wound up on the ground, he told police. Trayvon hit him in the face, and Zimmerman yelled for help.

Serino said Trayvon's father, Tracy Martin, listened to all of the 911 calls in the case before the entire family convened at City Hall to listen Friday night. When asked if the voice on one, a male calling for help was his son, told Serino no.

Police lied Friday, Crump said, when they said Tracy Martin said the voice crying for help was not his son. What Tracy Martin told police, Crump said, was that "he couldn't tell, that it was too distorted."

The audio has since been cleaned up, and now Tracy Martin has no doubt but that the voice is his son, Crump said.

Zimmerman told police that Trayvon was the aggressor. Police have found no credible evidence, Serino said, to contradict that.

"Everything we have is adding up to what he says," said Serino.

Lee said he has no qualms about the U.S. Department of Justice getting involved. He's been in touch with that office for several days, trying to set up a meeting, he said.

"If the DOJ wants to come in and look at what we've done, we are an open book," said Lee.

At the family's press conference Friday, Mary Cutcher, who lives in a townhome near where Trayvon was shot, described what she heard the night of the shooting. She said she heard what sounded like a child crying and then a gunshot. When Cutcher went outside, she said she saw Zimmerman crouched over the boy's body. Trayvon, who was shot once in the chest, was face down, Cutcher said.

"I thought it was common sense that [Zimmerman] would be arrested," Cutcher said. "This was not self-defense."

On Thursday the police department said witness Mary Cutcher's statement during a TV interview was "inconsistent" with what she told investigators.